Andrew Rossig and James Brady were convicted of reckless endangerment and unauthorised climbing but avoided jail time and will complete 200 hours of community service instead. They were fined $2,000 (£1,285) each for the stunt.

Sentencing them, judge Juan Merchan said: "These defendants tarnished the building before it even opened and sullied the memories of those who jumped on 9/11, not for sport but because they had to."

A third jumper, Marco Marckovich, will be sentenced on August 17.

Speaking after the hearing, Rossig showed remorse for the group's actions.

BASE Jumpers: Andrew Rossig and James Brady have been sentenced to a $2,000 fine and community service for the stunt (Photo: Reuters)

He said: "We understand that what we did could possibly have endangered other people and it's never going to happen again."

The trio undertook the controversial jump in September 2013 and used helmet cameras to record the dangerous act.

They later posted the footage to Youtube and it went viral, and has now been watched more than 3.5 million times.

The jumpers were soon criticised for their insensitivity and were arrested in March 2014.

New Building: One World Trade Center, also known as the "Freedom Tower", was built on the site of the former World Trade Center (Photo: Getty)

The building, which was still under construction at the time, is on the same site where 2,700 people lost their lives in the terrorist attacks of September 11, 2001.

A number of the victims jumped to their deaths from the towers rather than die in the infernos inside the collapsing towers.